PRGR 2015 iD Nabla Red Titan Face Iron - Designed with a Titanium face for big distance and rebound this club balances it all out with multiple vibration absorbers to enhance feel with a mild and soft impact. While the face is Titanium in #5 thru #9 irons it's body is a soft stainless ST-22 and overall throughout the club head there are 3 types of weighting, Tungsten, Nickel, and Carbon.